Use case A: Begin() called from constructor with items_height<0, then called again from Step() in StepNo 1 Use case B: Begin() called from constructor with items_height>0 FIXME-LEGACY: Ideally we should remove the Begin/End functions but they are part of the legacy API we still support. This is why some of the code in Step() calling Begin() and reassign some fields, spaghetti style.
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